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BRITISH STANDARD BS EN ISO 5167-22003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 2 Orifice plates The European Standard EN ISO 5167-22003 has the status of a British Standard ICS 17.120.10 Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI BS EN ISO 5167-22003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 18 March 2003 BSI 18 March 2003 ISBN 0 580 41456 6 National foreword This British Standard is the official English language version of EN ISO 5167-22003. It is identical with ISO 5167-22003. It, together with Parts 1, 3 and 4 of BS EN ISO 51672003, supersedes BS EN ISO 5167-11997 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee CPI/30, Measurement of fluid flow in closed conduits, to Subcommittee CPI/30/2, Pressure differential devices, which has the responsibility to A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests ined; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 47 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5167-2 March 2003 ICS 17.120.10Supersedes EN ISO 5167-11995 English version Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2 Orifice plates ISO 5167-22003 Mesure de dbit des fluides au moyen dappareils dprimognes insrs dans des conduites en charge de section circulaire - Partie 2 Diaphragmes ISO 5167- 22003 Durchflussmessung von Fluiden mit Drosselgerten in voll durchstrmten Leitungen mit Kreisquerschnitt - Teil 2 Blenden ISO 5167-22003 This European Standard was approved by CEN on 20 February 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions English, French, German. A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5167-22003 E Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI Foreword This document EN ISO 5167-22003 has been prepared by Technical Committee ISO/TC 30 “Measurement of fluid flow in closed conduits“ in collaboration with CMC. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2003, and conflicting national standards shall be withdrawn at the latest by September 2003. This document supersedes EN ISO 5167-11995. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and the United Kingdom. NOTE FROM CMC The foreword is susceptible to be amended on reception of the German language version. The confirmed or amended foreword, and when appropriate, the normative annex ZA for the references to international publications with their relevant European publications will be circulated with the German version. Endorsement notice The text of ISO 5167-22003 has been approved by CEN as EN ISO 5167-22003 without any modifications. EN ISO 5167−22003 Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI Reference number ISO 5167-22003E INTERNATIONAL STANDARD ISO 5167-2 First edition 2003-03-01 Measurement of fluid flow by means of pressure differential devices inserted in circular-cross section conduits running full Part 2 Orifice plates Mesure de dbit des fluides au moyen dappareils dprimognes insrs dans des conduites en charge de section circulaire Partie 2 Diaphragmes EN ISO 5167−22003 Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI EN ISO 5167−22003 ii Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI IS-7615 O23002E I SO 3002 All irhgts seredevr iii Contents Page Foreword............................................................................................................................................................iv Introduction ........................................................................................................................................................v 1 Scope......................................................................................................................................................1 2 Normative references ...........................................................................................................................1 3 Terms, definitions and symbols..........................................................................................................1 4 Principles of the of measurement and computation...........................................................2 5 Orifice plates .........................................................................................................................................2 5.1 Description.............................................................................................................................................2 5.2 Pressure tappings.................................................................................................................................6 5.3 Coefficients and corresponding uncertainties of orifice plates.....................................................10 5.4 Pressure loss, ∆ϖ................................................................................................................................13 6 Installation requirements ...................................................................................................................15 6.1 General.................................................................................................................................................15 6.2 Minimum upstream and downstream straight lengths for installation between various fittings and the orifice plate...............................................................................................................15 6.3 Flow conditioners ...............................................................................................................................20 6.4 Circularity and cylindricality of the pipe...........................................................................................26 6.5 Location of orifice plate and carrier rings........................................................................................27 6.6 of fixing and gaskets ............................................................................................................28 Annex A inative Tables of discharge coefficients and expansibility [expansion] factors..............29 Annex B inative Flow conditioners.......................................................................................................41 Bibliography .....................................................................................................................................................46 EN ISO 5167−22003 iii Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI IS-7615 O23002E vi I SO 3002 All irhgts seredevr Foreword ISO the International Organization for Standardization is a worldwide federation of national standards bodies ISO member bodies. The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission IEC on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5167-2 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits, Subcommittee SC 2, Pressure differential devices. This first edition of ISO 5167-2, together with the second edition of ISO 5167-1 and the first editions of ISO 5167-3 and ISO 5167-4, cancels and replaces the first edition of ISO 5167-11991, which has been technically revised, and ISO 5167-11991/Amd.11998. ISO 5167 consists of the following parts, under the general title Measurement of fluid flow by means of pressure differential devices inserted in circular-cross section conduits running full Part 1 General principles and requirements Part 2 Orifice plates Part 3 Nozzles and Venturi nozzles Part 4Venturi tubes EN ISO 5167−22003 iv Licensed Copy Institute Of Technology Tallaght, Institute of Technology, Thu Sep 07 101538 BST 2006, Uncontrolled Copy, c BSI IS-7615 O23002E I SO 3002 All irhgts seredevr v Introduction ISO 5167, consisting of four parts, covers the geometry and of use installation and operating conditions of orifice plates, nozzles and Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit. It also gives necessary ination for calculating the flowrate and its associated uncertainty. ISO 5167 all parts is applicable only to pressure differential devices in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase, but is not applicable to the measurement of pulsating flow. Furthermore, each of these devices can only be used within specified limits of pipe size and Reynolds number. ISO 5167 all parts deals with devices for which direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on their results and coefficients to be given with certain predictable limits of uncertainty. The devices introduced into the pipe are called “primary devices”. The term primary device also includes the pressure tappings. All other instruments or devices required for the measurement are known as “secondary devices”. ISO 5167 all parts covers primary devices; secondary devices1 will be mentioned only occasionally. ISO 5167 consists of the following four parts. a ISO 5167-1 gives general terms and definitions, symbols, principles and requirements as well as s of measurement and uncertainty that are to be used in conjunction with ISO 5167-2, ISO 5167-3 and ISO 5167-4. b ISO 5167-2 specifies orifice plates, which can be used with corner pressure tappings, D and D/2 pressure tappings2, and flange pressure tappings. c ISO 5167-3 specifies ISA 1932 nozzles3, long radius nozzles and Venturi nozzles, which differ in shape and in the position of the pressure tappings. d ISO 5167-4 specifies classical Venturi tubes4. Aspects of safety are not dealt with in Parts 1 to 4 of ISO 5167. It is the responsibility of the user to ensure that the system meets applicable safety regulations. ___________________________ 1 See ISO 21861973, Fluid flow in closed conduits Connections for pressure signal transmissions between primary and secondary elements. 2 Orifice plates with “vena contracta” pressure tappings are not considered in ISO 5167. 3 ISA is the abbreviation for the International Federation of the National Standardizing Associations, which was succeeded by ISO i
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